Boolean options not available

Hi. I’m trying to use the boolean options to remove the outer pattern (black) from the inner blue frame and weld the two together as one. But no matter what i try… grouping as two sets, order etc, but the only boolean option have to use is weld.

Ok… but my Boolean assistant is not highlighted (can’t click on it).

ThunderBoss 1.lbrn2 (2.3 MB)

Can i ask how you found

  1. the stray line…
  2. how do you know the line are closed…
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Thankyou very much… new to stuff, still learning.

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